Finding the Fourth Proportional to 123,411.78, 170,311.38 and 75,691.44

Step by Step Solution

1. Step 1: Write the proportion equation
   123,411.78 : 170,311.38 = 75,691.44 : x
2. Step 2: Convert to fraction form
   123,411.78/170,311.38 = 75,691.44/x
3. Step 3: Cross multiply
   123,411.78x = 170,311.38 × 75,691.44
4. Step 4: Simplify right side
   123,411.78x = 12,891,113,600.59
5. Step 5: Solve for x
   x = 12,891,113,600.59/123,411.78
6. Step 6: Final answer
   x = 104,456.10